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COMMITMENTS AND CONTINGENCIES - Schedule of Guarantees and Indemnifications (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Oct. 25, 2019
Various - Surety Bonds    
Guarantor Obligations [Line Items]    
Maximum Exposure $ 29.2  
Rocky River Realty Company and Eversource Service - Lease Payments for Real Estate    
Guarantor Obligations [Line Items]    
Maximum Exposure 6.5  
Bay State Wind LLC - Real Estate Purchase    
Guarantor Obligations [Line Items]    
Maximum Exposure 2.5  
Sunrise Wind LLC - Offshore Wind    
Guarantor Obligations [Line Items]    
Maximum Exposure $ 2.2  
Sunrise Wind, LLC    
Guarantor Obligations [Line Items]    
Maximum Exposure   $ 15.4
Ownership interest   50.00%